Furnace.



H. ISERMAN.

FURNACE.

APPLICATION FILED NOV. 7, 1911.

Patented Jan. 19, 1915.

2 SHEETS-SHEET l.

INVENTO/f Robvvuvb SAW,

WITNESSES: 41 W w ATTORNEY H. ISERMAN.

FURNACE JILPPLIGATION FILED NOV.7, 1911.

-igg g g Patented Jan. 19, 1915.

2 SHEETS-SHEET 2.

W/TIMSSES: INVENTOH Kiwi/W messes.

I ISIERMAN, OF NEW! HYDE PARK, NEW YGRK, ASSIGNOR T MULTIPLE-GRATE- 3&3. ENDLESS CHAIN STQKER SOMPANY, A GGRPORATION OF NEN YORK.

FUREACE.

triginai application filed September 11,

To all whom it may concern Be it known that I, HARVEY ISERMAN, a citizen of the United States, residing at. New Hyde Park, in the county of Nassau and State of New York, have invented a certain new and useful improvement in Furnaces, of which the following is a full elear, and exact description.v

My invention is an improvement in furnaces and, while of general applicability, it is especially adapted for use in furnaces Where mechanical stokers" or" the endless traveling grate type are employed The object of my invention is to provide a furnace having an ignition arch under which the first stages of combustion shall take place, and which arch shall be at the same distance above the flat horizontal grate at all points of its breadth, and to so construct the furnace "front that no horizontal thrust shall be exerted against the side walls. I accomplish these results by supporting the furnace front and that part of the weight of the boiler and its contents which said furnace front receives, on structural iron or steel beams resting on the side Walls and protect these beams from the fire firebrick blocks carried on doors which are mounted to swing under the said beams.

I construct the ignition arch and to so locate it with relation to other cooperating parts to be later-described as to provide more complete and eilicient combustion of the fuel than has hitherto been obtained.

This application is a division of my prior led September 11th,1911. I v

in the drawings, Figure 1 is a cent al the furna e l, the fuel hopper being' rethe doors being open to .zr'uction; and Fig.3 is a pen Fig. 2 is a partial front view of shown. in Fig. moved and on show its con siectire er the special lire-brick llilllil forl i D the doors.

its shown in the drawing, 3; 1s

' specification of Letters Patent.

steam Patented Jan. 19, it 5.

1913., Serial No. 648.?45. Divided and tnisepplicaticn filed November 7, 1911. Serial No. 658,926. r

' boiler mounted in the usual furnace structure which has side Walls 4 and the front Wall'5. The front of the furnace covered by a metal plate 6 "which extends down over the side walls, forming a covering therefor and a. means of mounting the doors, hopper,

. side plates and other parts of the mechanism to be later described. Instead of the custernary arch for'carrying the front Wall, andarch in that there is no horizontal thrust exerted against the side Walls.

1 protect the lower faces of the member or members 7 from the heat of the fire by the brick 8Wl1lCl1 are mounted on doors 9 These doors, of which there are two, (one being open in Fig. 2) have a flofit plate 10 of suliicient Width to cover the brick of arch 5 below the front plate 6 and to extend down and form the front of a Water cooled chamber 11' which extends the full width of the door. The metal Walled chamber 11, aside from forming a support for the lire-brick 8, serves to protect the brick from the a rasive action of the fuel as it passes from hopper on to the grate.

The doors are mounted on hinges bolted thereto and provided with riiices to receive hinge pins l l, l5 bolted on the front-plate b. The hinge pin 15 is threaded and provided with a nut 16. By turning the nut 16 the position of thedoor niay'be tically adjusted to adjust the space betv; the door?) and the Jeling grate. It will be understrmd of course, that the briel-zs 8 must he b cdwhen the position oi the doors steo, to provide brick of proper size to, to and protect the metal parts 7. The doors are shown in their highest p0 ion in r Supports 1210f adjustaole length aid in carrying the Weight of the doors. r

Water is supplied to-the water cooled chambers 11 through pipe 17 and is drawn 05 through pipe 18. These pipes are provided 'y tiith swivel connections 20, 21 to permit the openin and closing of the doors 9, and with flexible connections 22, 23 to permit of the vertical' adjustment of the doors and the pipes carried thereby. I prefer to employ oiler feed water for cooling the doors thus preheating said feed water and increasing the efiicienc of the boiler.

' The firehric'k 8, of which any number may be employed but of which three are shown for each door, are provided with a.

shoulder 24 to fit over the chamber 11, and with apertures 241 to receive bolts 25 havingnuts26 to fasten the brick to the front plate of the door. After the brick are fastoned-in place the cavity 27 may be filled with clay or like material. Grooves 130 in thogsidesuocf the brick 8 receive correspondiugjridg'es 131 on adjacent brick, thus lockin the brick more securely in position.

The fire-brick 8 are beveled toward the mar givin a slight incline to the lower surface of t e ignition arch 100, as clearly shown in Figs. 1 and 3. It is through the narrow space between the fuel bed and this ignition arch 100 that the carbon and gases released on ignition must pass and it is here that they are consumed.

A fuel hopper 28 is removablyattached to the furnace front by inclined fingers 29 entering ears 30 bolted to said front. Openings 32 are provided in the hopper sides to accommodate the water pipes 17 and 18'.

I have illustrated my furnace as used in connection with an' endless traveling grate stoker 33, the specific structure of which however, forms no part of the present invention. This grate travels over front sprockets 34: and is provided with the actuating mechanism 36, 37, 38 and tension regulating devices 39 all as fully described and claimed in my prior application above referred to. Forced draft for the furnace is supplied by the blast pipe 40 which is located, as clearly shown in Fig. 1, below the upper run of the grate and a little forward of the ignition arch 100. The position of this blast pipe is of importance as it is so located that ignition of the coal takes place as soon as it asses under the water cooled chamber 11. lhe free carbon, carbon monoxid, and hydrocarbons, liberated in the first stages of combustion, are thus compelled to pass through the constricted passage between the highly heated i ition arch and the glowing bedof fuel. the temperature to which they are thus subjected the ases and free carbon ,are totally. oxidiz due to the excess oxygen of the blast, smoke is prevented, and all the high heat units resulting from such complete combustion are utilized. My furnace front is also ocially adapted for use with mechanical debts of the type indicated, for the reason that in devices ofthis character it is highly also for the reason that in such arches the bricks will work loose through repeated heating and cooling. The combination of a flat arch supported on structural iron beams, with the beams protected from the fire, obviates the objections noted above to both the springing and flat arches, and the doors, aside from providing a convenient means of protecting the flat arch, furnish convenient access to .the interior of the furnace for purposes of repair or firing.

Having thus described my invention, what I claim is 1. In a furnace, a front wall, a fiat arch carryin the front wall, and an ignition arch below t e flat arch and mounted to swing thereunder.

2. In a furnace, a front wall, a flat arch carrying the front wall, horizontally swinging doors, and an ignition arch carried b said doors in position to protect the flat arc when the doors are closed.

3. In a furnace, a grate, a front wall, a flat arch carrying the front wall, and an ignition 'arch mounted to swing below the front wall and into operative position above said grate.

4. n a furnace, a grate, a front wall, a flat arch carrying the front wall, horizon tally swinging doors, and an ignition arch, mounted on said doors above said grate, in position to protect the flat arch when the doors are closed.

5. In afurnace, a front well, an arch supportin said front wall, a grate, a pairof vertica ly adjustable doors mounted above said grate and in position to swing under said arch, each door having a water-cooled fueldistributing front plate, and fire brick bolted to said door and resting on said water-cooled front plate.

6. In a furnace, side walls, a front wall, iron beams resting on the side walls and supporting the front wall, in combination with doors mounted to swing under the front wall and carrying an ignition arch in posi' tion to cover and protect the iron beams when ,the door is closed.

7;. In a furnace, side walls, a front wall supporting means resting on the side walls and supporting the front wall, in combination with doors mounted to swing under the front wall and ca'rrying an iamtwaa ch in a m ooo said doors and resting on. said Water-walled chambers, said doom being so looafiod and said fiw-brioko so shaped when o doors are closet the fia'obricks form 1p tiozz arch above fire one? aiiso so? prooect the sfimotuml iron flow. heat of the fiaro 1m izestimony wboreoi", I i hermmto my signofizure in tho presenoo of two ESERMEETE F @omug Jogm Y Q 

